Customizing the classified listings and details page

I am using this site as a sandbox to gain experience with this plugin.
I would like to be able to customize the details page of a classified but do not know where the code for this is and where i should insert my info and my own custom fields.

as an example, I wish there to be an address associated with each post, and a map on each classified posting. Or how do I rearrange the layout of the page.

here is an example...

http://classifiedtest.jeffserver.com/?classifieds=pauls-second-front-end-test

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